Global Biogas Generator Market By Type (By Feedstock Type , Agricultural Waste , Energy Crops , Sewage Sludge , Industrial Waste , Food & Beverages Waste , Others , By Products , Single-Fuel BioGas Generator , and Dual-Fuel BioGas Generator), By Application (Household Electricity , and Commercial Electricity), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2020-2029